function soloNumeros(evt, conComa) {
	  var theEvent = evt || window.event;
	  var key = theEvent.keyCode || theEvent.which;
	  key = String.fromCharCode( key );
	  
	  var regex 
	  if(conComa){
		  regex = /[0-9]|\./;
	  }else{
		  regex = /[0-9]/;
	  }
		  
	  if( !regex.test(key) ) {
	    theEvent.returnValue = false;
	    if(theEvent.preventDefault) theEvent.preventDefault();
	  }
}